Improvement in machines for sawing wood



PATENT OFFICE.

JAEvIs oAsE, oF LA EAYETTE, INDIANA.

IMPROVEMENT IN MACHINES FOR SAWING WOOD.

Specification forming part of Letters Patent No. 41,667,

T0 all whom, it may concern.-

Be it known thatI, JARVIS CASE, of La Fnyette, in the c `unty ot Tippecanoe and State of Indiana, have invented a new and useful Improvement in Cross-Gut SawingMachines; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and

to the letters of reference marked thereon.

My invention consists of a peculiar construction of' crosscut sawing-machine, operated by means ofa horizontal crank-wheel.

In the accompanying drawings, Figure l is a top view of my machine. Fig. 2 is a side elevation of the same.

The bed-pieces A of the frame are common to the horse-power and sawin gmachine proper. The horses are attached to the lever C in the usual manner, and in passing round they travel over the pitman H, upon the tloor It, which extends from wheel B to the oblique post W, (but is cut away in the drawings in order to show the pitman H.) The cog-wheel D gears into the pinion E, and wheel F into pinion G, thus multiplying the speed of the crank-wheel B. The two pitmen H and I are supported and guided by a swinging arm, K, attached to a rocking shaf't set transversely of the machine. This arm swings freely forward' and backward in the plane of the saw, but on account of the transverse rock-shaft the lateral motion of the pitman is prevented. By this simple arrangement the pitman I is made to Work in line with the plane of the saw without the usual friction attending sliding guides.

In order to elevate and depress the saw at pleasure, and also to prevent the lateral motion of the saw, I have arranged the sawguide M upon the rocking shaft M, to which is attached the lever N. This saw-guide has I fingers m embracing the saw, and keeping' it in direct line with the Inotion of the pitman I. A hinged guide, U, with ngers w, directs the dated February 16, 1864.

point of the saw when it begins to cut, (the points of the fingers resting upon the top of the log.) After the saw has made a few strokes the log itself acts as a guide, and the auxiliary guide U remains at the top of the log while the saw descends, as seen in Fig. 2. Attached to the guide M are rollers Y, for directing the pitman I and preventing friction. By means of the lever N the sawguide M may be raised and lowered at pleasure, carrying the pitman and saw. A notched bar, P, locks this lever in any desired position, and a balance-weight, O, assists in working the lever.

In practice I find this saw-guide M and the swinging arm K are efficient, and I prefer them to more complicated arrangements.

I am aware that a rocking support has been employed to guide the pitman or conmeeting-rod, and.that a swinging arm without a transverse rock-shaft has also been employed for the same purpose, therefore I do not claim such devices; and I do not broadly claim the transverse rock-shaft with a swinging arm, but confine my claim to the peculiar arrangement above described.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

l. The arrangement and combination of the horizontal crank-wheel B with the two pitmen H and I and the swinging arm K, attached to the rocking shaft, for operating the cross-cut saw and allowing the horses to pass between the wheel B and the saw, substantially as set forth.

2. The auxiliary saw-guide U, with its iingers w, in combination with the fingers m, substantially as described.

JARVIS CASE.

Witnesses:

DANIEL BREED, J oHN BLAcKIE. 

